This manual covers the Yamaha 4LH Outboard motor manufactured in 1987. Designed as a reliable water-cooled gasoline outboard motor, this unit represents a significant advancement in marine propulsion technology for its era. Its robust construction and straightforward engineering ensure dependable performance for a variety of boating applications. This comprehensive Service Repair Maintenance Manual provides detailed instructions for disassembly, repair, assembly, and inspection procedures. It includes exploded diagrams to aid in understanding component relationships and facilitates proper maintenance and troubleshooting. This guide is an essential resource for owners and technicians seeking to maintain the optimal performance and longevity of their Yamaha 4LH Outboard.